Practice Test on Thermodynamics - Set 14 - ObjectiveBooks

# Practice Test: Question Set - 14

1. The efficiency of Diesel cycle approaches to Otto cycle efficiency when
(A) Cut-off is decreased
(B) Cut-off is constant
(C) Cut-off is increased
(D) Cut-off is zero

2. According to Clausius’ statement of second law of thermodynamics
(A) Heat can't be transferred from low temperature source to high temperature source
(B) Heat can be transferred for low temperature to high temperature source by using refrigeration cycle
(C) Heat can be transferred from low temperature to high temperature source if COP of process is more than unity
(D) Heat can't be transferred from low temperature to high temperature source without the aid of external energy

3. Thermal power plant works on
(A) Carnot cycle
(B) Joule cycle
(C) Rankine cycle
(D) Otto cycle

4. The atomic mass of oxygen is
(A) 14
(B) 16
(C) 18
(D) 121

5. An adiabatic process is one in which
(A) The temperature of the gas changes
(B) No heat enters or leaves the gas
(C) The change in internal energy is equal to the mechanical work done
(D) All of the above

6. Which of the following is an irreversible cycle?
(A) Carnot
(B) Stirling
(C) Ericsson
(D) None of the above

7. Otto cycle consists of following four processes
(A) Two isothermal and two isentropic
(B) Two isentropic and two constant volumes
(C) Two isentropic, one constant volume and one constant pressure
(D) Two isentropic and two constant pressures

8. The efficiency of a Carnot engine depends on
(A) Working substance
(B) Design of engine
(C) Size of engine
(D) Temperatures of source and sink

9. For same compression ratio and for same heat added
(A) Otto cycle is more efficient than Diesel cycle
(B) Diesel cycle is more efficient than Otto cycle
(C) Efficiency depends on other factors
(D) Both Otto and Diesel cycles are equally efficient

10. Which of the following statement is incorrect?
(A) The liquid fuels have higher calorific value than solid fuels
(B) The solid fuels have higher calorific value than liquid fuels
(C) A good fuel should have low ignition point
(D) The liquid fuels consist of hydrocarbons

11. The compression ratio for petrol engines is
(A) 3 to 6
(B) 5 to 8
(C) 10 to 20
(D) 15 to 30

12. The efficiency of Carnot cycle is maximum for
(A) Gas engine
(B) Petrol engine
(C) Steam engine
(D) Reversible engine

13. The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called
(A) Specific heat at constant volume
(B) Specific heat at constant pressure
(C) Kilo Joule
(D) None of these

14. Diesel cycle consists of following four processes
(A) Two isothermal and two isentropic
(B) Two isentropic and two constant volumes
(C) Two isentropic, one constant volume and one constant pressure
(D) Two isentropic and two constant pressures

15. If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle
(A) More
(B) Less
(C) Equal
(D) Depends on other factors

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